News:

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Better yet, do use the 1/8" copper tubing as mentioned above, with compression fittings, use a long enuff piece of tubing and make a one or two double loop at the fire wall before going into interior to gauge and get enuff black 1/8 or 3/32 rubber vacumn hose to slip over the entire length of tubing to the grommet. The loop will absorbe vibration that could cause a break in copper and rubber hose will protect and color tubing black. Make sense? Works for me and I didn't stay at the Holiday Inn.

As for he rubber grommet issue, the Trifive chevy applications have such a grommet for wiper motor cable or you can go to Lowes and look thru their rubber or plastic blank plugs and fit as needed.

Copper tubing isn't a great idea for an oil pressure line - copper work-hardens with movement and vibration and fractures/cracks. Metal oil pressure lines on GM cars after about 1960 were copper-plated steel or plain steel, then changed to nylon.

I guess everyone's stores are different, but I went to a True Value and they have the drawers with the parts in there. Must have had 50 different sizes. I haven't had much luck with Lowes or Home Depot type places. I could even throw one in an envelope if you like.

Let's see.One of our test vehicles burnt to the ground with a copper line for a fuel pressure guage that work hardened and broke. The fire got hot enough that it melted the wheels off the car....

And I had a test vehicle that I was driving and the oil pressure line work hardened and broke. It poured out a lot of smoke, but I got lucky and it didn't catch fire and I didn't ruin the motor (special cam / lifter test vehicle no less).

Also to note, the run-of-the-mill compression fitting on the black plastic line wont seal the factory style sending unit and gauge.

Just for reference, this is the firewall grommet, which I don't believe is repo'd yet:

Within the last week, I came across a grommet that "appeared" to be the same on another 69, but with a different use (warning light car). I really cant think of where it was right now, and I didnt check to see if it is the same dimensions or not.